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			<p><a href="https://www.jianshu.com/p/bfc3e319a96b">https://www.jianshu.com/p/bfc3e319a96b</a></p>
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				微任务</br>
				process.nextTick</br>
				MutationObserver</br>
				Promise.then catch finally
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				宏任务</br>
				JS进来的主代码块【注意】</br>
				I/O</br>
				setTimeout</br>
				setInterval</br>
				setImmediate</br>
				requestAnimationFrame
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